public void Test()
{
var container = new OrderedMultiDictionary <string, float>();
container.Add("hoge", 42f);
Assert.AreEqual(42f, container["hoge"][0]);
Assert.AreEqual(0, container["fuga"].Count);
container.Add("hoge", 97f);
Assert.False(container.Remove("piyo"));
Assert.True(container.Remove("hoge"));
}